Aero-Radionav. This band is used heavily for
radiolocation and radionavigation performing long-range air surveillance and enroute air-traffic control
functions. The DOD and FAA recently deployed a
modernized Air-Route Surveillance Radar Model 4
(ARSR-4) in this band for air-defense, drug
interdiction and air-traffic control.

FAA Aero-Radionav. The FAA and aviation users
depend upon air-route surveillance radars (ARSRs) to
obtain aircraft position information in support of
enroute air-traffic control.

Military Aero-Radionav. The Air Force and Navy
make use of it for high-power long-range surveillance
radars and air-traffic control radars, in support of
national defense missions.

Drug Interdiction. In this application, radar
equipment is mounted on tethered balloons along the
southern border of the U.S. to detect low-flying aircraft
entering U.S. airspace.

Radio Astronomy. Observations are made of highly
redshifted hydrogen spectral lines that occur in the
1330- 1350 MHz band.

Military Radars. This band is heavily used for
various military radiolocation applications for high-power long-range surveillance radars. The DOD and
FAA recently deployed a modernized Air-Route
Surveillance Radar Model 4 (ARSR-4) in this band for
air-defense, drug interdiction and air-traffic control.

Radio Astronomy. Radio astronomy observations
are made in this band of highly redshifted hydrogen
spectral lines that occur in this band. Knowledge of
other galaxies and the early universe comes from
these observations.

Fixed & Mobile. This band is seeing increased use
for fixed links and mobile links since the Federal fixed
and mobile service allocations were upgraded to
primary in 1989.

No changes are planned.
Use expected to increase.

1369.05-
1370

FIXED

MOBILE

RADIOLOCATION

S5.149 US311 S5.334
G2 G27 G114

FIXED SATELLITE
G114

MOBILE SATELLITE
G114

AERONAUTICAL
RADIONAVIGATION
S5.334

Military Radars. This band is heavily used for
various military radiolocation applications for high-power long-range surveillance radars. The DOD and
FAA recently deployed a modernized Air-Route
Surveillance Radar Model 4 (ARSR-4) in this band for
air-defense, drug interdiction and air-traffic control.

Radio Astronomy. Radio astronomy observations
are made in this band of highly redshifted hydrogen
spectral lines that occur in this band. Knowledge of
other galaxies and the early universe comes from
these observations.

Fixed & Mobile. This band is seeing increased use
for fixed links and mobile links since the Federal fixed
and mobile service allocations were upgraded to
primary in 1989.

Telecommand Ops. DOD uses this band for drone
telecommand at military test ranges.

No changes are planned.
Use expected to increase.

1370-
1393.05

FIXED

MOBILE

RADIOLOCATION

S5.149 US311 S5.334
S5.339 G2 G27 G114

FIXED SATELLITE
G114

MOBILE SATELLITE
G114

Space Research
(passive) S5.339

Earth Exploration-Satellite (passive)
S5.339

Military Radars. This band is heavily used for
various military radiolocation applications for high-power long-range surveillance radars. The DOD and
FAA recently deployed a modernized Air-Route
Surveillance Radar Model 4 (ARSR-4) in this band for
air-defense, drug interdiction and air-traffic control.

GPS. GPS operates on 1381.05 to relay data on
nuclear bursts detected by orbiting satellites. This
specific requirement is limited to U.S. satellites.

Radio Astronomy. Observations are made of highly
redshifted hydrogen spectral lines that occur in this
band. Knowledge of other galaxies and the early
universe comes from these observations.

Passive Research. NASA performs passive space
research and Earth exploration-satellite observations.
The band 1370-1400 MHz is used for remote sensing
of salinity and soil moisture.

Fixed & Mobile. This band is seeing increased use
for fixed links and mobile links, since the Federal fixed
and mobile service allocations were upgraded to
primary in 1989.

NTIA identified 1390-
1400 MHz for reallocation
under OBRA-93, and
reallocated to the private
sector on Jan 1, 1999.

1393.05-
1400

FIXED

MOBILE

RADIOLOCATION

S5.149 US311 S5.334
S5.339 G2 G27

Space Research
(passive) S5.339

Earth Exploration-Satellite (passive)
S5.339

Military Radars. This band is used for various
military radiolocation applications for high-power long-range surveillance radars. The DOD and FAA
recently deployed a modernized Air-Route
Surveillance Radar Model 4 (ARSR-4) in this band for
air-defense, drug interdiction and air-traffic control.

Fixed & Mobile. This band is seeing increased use
for fixed links and mobile links, since the Federal fixed
and mobile service allocations were upgraded to
primary in 1989.

Passive Research. NASA performs passive space
research and Earth exploration-satellite observations.
The band 1370-1400 MHz is used for remote sensing
of salinity and soil moisture.

Radio Astronomy. Radio astronomy observations
are made in this band of highly redshifted hydrogen
spectral lines that occur in this band. Knowledge of
other galaxies and the early universe comes from
these observations.

Medical Telemetry. Various Federal agencies
operate medical telemetry devices in the 1395-1400
MHz band throughout the United States.

NTIA identified 1390-
1400 MHz for reallocation
under OBRA-93, and
reallocated to the private
sector on Jan 1, 1999;
however, 17 Federal sites
will continue to operate for
14 years (see NTIA Report
SP 95-32). The band
1385-1390 MHz was
returned per the Defense
Authorization Act of 2000.

1400- 1427

EARTH EXPLORATION-SATELLITE (passive)

RADIO ASTRONOMY

SPACE RESEARCH
(passive)

US74 US246 S5.341

None

Passive Research. Space-based observations and
measurements to advance many areas of global
change research such as sea salinity and
temperature measurements, soil moisture, etc. are
made in this band.

Radio Astronomy. Hydrogen line observations are
made in this band.

Scientific research is
expected to continue and
increase in this band.

1427- 1429

FIXED

MOBILE except
aeronautical mobile

SPACE OPERATION

(Earth-to-space)

S5.341 G30

None

None

Under the OBRA-93 and
BBA-97, the band 1427-
1435 MHz was identified
for reallocation for
exclusive non-Federal
government use on
January 1999; however, 14
sites were identified to
allow essential Federal
operations to continue until
January 2004.

1429- 1435

FIXED

MOBILE

S5.341 G30

None

Fixed & Mobile. Though this band was reallocated
for exclusive non-Federal use, essential Federal
operations will continue at 14 sites until January 2004.

Medical Telemetry. Various Federal agencies
operate medical telemetry devices in the 1429-1435
MHz band throughout the United States.

Under the OBRA-93 and
BBA-97, the band 1427-
1435 MHz was identified
for reallocation for
exclusive non-Federal
government use on
January 1999; however, 14
sites were identified to
allow essential Federal
operations to continue until
January 2004.

1435- 1525

MOBILE

(Aeronautical
telemetering) S5.343

S5.341 US78

None

Aeronautical Telemetry. Vital and extensive use of
the band 1435- 1535 MHz is for aeronautical
telemetry and associated telecommand operations for
flight testing of manned or unmanned aircraft and
missiles, or their major components as well as for
equipment development functions.

No changes are planned.
Use expected to continue.

1525- 1530

MOBILE-SATELLITE
(space-to-Earth)

Earth Exploration-Satellite

Fixed

Mobile S5.343

S5.341 S5.351 S5.354
US78

None

INMARSAT. Naval and USCG ships and vessels use
INMARSAT for distress and safety communications
as well as for general communications services.

Aeronautical Telemetry. Vital and extensive use of
the band 1435- 1535 MHz is for aeronautical
telemetry and associated telecommand operations for
flight testing of manned or unmanned aircraft and
missiles, or their major components as well as for
equipment development functions.

No changes are planned.
Use expected to continue.

1530- 1533

MOBILE-SATELLITE

(space-to-Earth)

Mobile (Aeronautical

Telemetry)

S5.341 S5.351 S5.354
US78 US315

None

INMARSAT. Naval and Coast Guard ships and
vessels use INMARSAT for distress and safety
communications (1530- 1545 MHz, space-to-Earth)
as well as for general communications services.

Aeronautical Telemetry. Vital and extensive use of
the band 1435- 1535 MHz is for aeronautical
telemetry and associated telecommand operations for
flight testing of manned or unmanned aircraft and
missiles, or their major components as well as for
equipment development functions.

No changes are planned.
Use expected to continue.

1533- 1535

MOBILE-SATELLITE

(space-to-Earth)

Mobile (Aeronautical

Telemetry)

S5.341 S5.351 S5.352
S5.354 US78 US315

None

INMARSAT. Naval and Coast Guard ships and
vessels use INMARSAT for distress and safety
communications (1530- 1545 MHz, space-to-Earth)
as well as for general communications services.

Aeronautical Telemetry. Vital and extensive use of
the band 1435- 1535 MHz is for aeronautical
telemetry and associated telecommand operations for
flight testing of manned or unmanned aircraft and
missiles, or their major components as well as for
equipment development functions.

No changes are planned.
Use expected to continue.

1535- 1544

MOBILE-SATELLITE
(space-to-Earth)

S5.341 S5.351
S5.353A S5.354 S5.356
S5.357A US308 US309
US315

None

INMARSAT. INMARSAT downlinks to various
Federal agencies' for operational use.

GPS. The Global Positioning System operates on
1575.42 MHz ± 12 MHz (L1 link) as part of the
radionavigation-satellite service. The GPS is a
multisatellite system with large numbers of U.S. and
international users. ICAO has recognized the GPS
and GLONASS as the two principal candidates for
the Global Navigation Satellite System.

As the U.S. transitions to
satellite-base navigation,
the FAA is developing a
GPS wide area
augmentation sys (WAAS)
as a safety-critical sys for
aviation users to support
en route through precision
approach navigation. The
WAAS will operate as an
overlay on the GPS L1 link
in the 1559-1610 MHz
band.

Radio Astronomy. NASA operates a deep space
system 70-meter antenna in support of radio
astronomy observations. Radio Astronomy
observations are performed in this band to study the
hydroxyl radical spectral lines allowing study of stellar
and expansion velocities, validate theories of the
origins, and evolution of the Universe.

Use expected to continue.

1610.6-
1613.8

AERONAUTICAL

RADIONAVIGATION

US260

RADIODETERMINATION- SATELLITE (Earth-to-space)

MOBILE-SATELLITE
(Earth-to-space) US319

RADIO ASTRONOMY

US208 S5.149
S5.341 S5.364 S5.366
S5.367 S5.368 S5.372

AERONAUTICAL
RADIONAVIGATION
SATELLITE S5.366

Aeronautical Mobile
US260

AERONAUTICAL
MOBILE-SATELLITE (R)
S5.367

Radio Astronomy. NASA operates a deep space
system 70-meter antenna in support of radio
astronomy observations. Radio Astronomy
observations are performed in this band to study the
hydroxyl radical spectral lines allowing study of stellar
and expansion velocities, validate theories of the
origins, and evolution of the Universe.

Scientific research is
expected to continue and
increase in this band.

1613.8-
1626.5

AERONAUTICAL RADIONAVIGATION

US260

RADIODETERMINATION- SATELLITE (Earth-to-space)

MOBILE-SATELLITE
(Earth-to-space) US319

Mobile-Satellite

(space-to-Earth)

US208 S5.341
S5.364 S5.365 S5.366
S5.367 S5.372 S5.368

AERONAUTICAL
RADIONAVIGATION-SATELLITE S5.366

Aeronautical Mobile .
US260

AERONAUTICAL
MOBILE- SATELLITE
(R) S5.367

Mobile Satellite. Federal government agencies are
users of commercial mobile satellite services offered
in this band supporting terrestrial, ship, and airborne
scientific research experiments and missions.

NASA DSN Radio Astronomy. NASA operates a
deep space system 70-meter antenna in support of
radio astronomy observations. Radio Astronomy
observations are performed in this band to study the
hydroxyl radical spectral lines allowing study of stellar
and expansion velocities, validate theories of the
origins, and evolution of the Universe.

Scientific research is
expected to continue and
increase in this band.

NASA DSN Radio Astronomy. NASA operates a
deep space system 70-meter antenna in support of
radio astronomy observations. Radio Astronomy
observations are performed in this band to study the
hydroxyl radical spectral lines allowing study of stellar
and expansion velocities, validate theories of the
origins, and evolution of the Universe.

Scientific research is
expected to continue and
increase in this band.

Satellite communications
will continue for the
foreseeable future.

1660.5-
1668.4

RADIO ASTRONOMY

SPACE RESEARCH

(passive)

US74 US246 S5.341

None

NASA DSN Radio Astronomy. NASA operates a
deep space system 70-meter antenna in support of
radio astronomy observations. Radio Astronomy
observations are performed in this band to study the
hydroxyl radical spectral lines allowing study of stellar
and expansion velocities, validate theories of the
origins, and evolution of the Universe.

Scientific research is
expected to continue and
increase in this band.

1668.4-
1670

METEOROLOGICAL
AIDS (Radiosonde)

RADIO ASTRONOMY

S5.149 US74 US99
S5.341

None

NASA DSN Radio Astronomy. NASA operates a
deep space system 70-meter antenna in support of
radio astronomy observations. Radio Astronomy
observations are performed in this band to study the
hydroxyl radical spectral lines allowing study of stellar
and expansion velocities, validate theories of the
origins, and evolution of the Universe.

Scientific research is
expected to continue and
increase in this band.

Point-to-Point. Numerous Federal agencies
operate fixed point-to-point medium capacity
microwave systems in this band for such purposes as
hydropower and dam control, air traffic control
communications, Federal law enforcement, natural
resource management, tactical radio relay.

Fixed & Mobile. Mobile use both on ground and
airborne are for air-to-ground video telemetry, air
combat training systems, guided weapons systems
and robotics control.

Under the OBRA-93, the
band 1710- 1755 MHz
was identified for
reallocation to the private
sector for mixed use on
January 1999. Use is
TBD. Also under OBRA-93, 16 Federal sites
providing essential
operations will be retained
indefinitely in the band
1710- 1755 MHz.

1718.8-
1722.2

FIXED

MOBILE

US256 S5.341

Radio Astronomy
US256

Point-to-Point. Numerous Federal agencies
operate fixed point-to-point medium capacity
microwave systems in this band for such purposes as
hydropower and dam control, air traffic control
communications, Federal law enforcement, natural
resource management, tactical radio relay.

Fixed & Mobile. Mobile use both on ground and
airborne are for air-to-ground video telemetry, air
combat training systems, guided weapons systems
and robotics control.

Radio Astronomy. Observations are performed in
this band to study the hydroxyl radical spectral lines
allowing study of stellar and expansion velocities,
validate theories of the origins, and evolution of the
Universe.

Under the OBRA-93, the
band 1710- 1755 MHz
was identified for
reallocation to the private
sector for mixed use on
January 1999. Use is
TBD. Approximately 16
Federal sites providing
essential operations will be
retained indefinitely in the
band 1710- 1755 MHz.

1722.2-
1761

FIXED

MOBILE

S5.341

None

Point-to-Point. Numerous Federal agencies
operate fixed point-to-point medium capacity
microwave systems in this band for such purposes as
hydropower and dam control, air traffic control
communications, Federal law enforcement, natural
resource management, tactical radio relay.

Fixed & Mobile. Mobile use both on ground and
airborne are for air-to-ground video telemetry, air
combat training systems, guided weapons systems
and robotics control. Additionally, some agencies are
using WLANs and tactical point-to-point
communications systems in the 1755-1850 MHz
band.

Under the OBRA-93, the
band 1710- 1755 MHz
was identified for
reallocation to the private
sector for mixed use on
January 1999. Use is
TBD. Approximately 16
Federal sites providing
essential operations will be
retained indefinitely in the
band 1710- 1755 MHz.

1761- 1842

FIXED

MOBILE

S5.341 G42

SPACE OPERATIONS
G42

Space Ops. The Air Force Satellite Control Network
and Satellite Ground Link Subsystem users have
uplink channels for the tracking and telecommand of
various NGSO satellites.

NASA. This band is used for Shuttle payload
interrogation and for data air telemetry links.

Point-to-Point. Numerous Federal agencies
operate fixed point-to-point medium capacity
microwave systems in this band for such purposes as
hydropower and dam control, air traffic control
communications, Federal law enforcement, natural
resource management, tactical radio relay.

Fixed & Mobile. Mobile use both on ground and
airborne are for air-to-ground video telemetry, air
combat training systems, guided weapons systems
and robotics control. Additionally, some agencies are
using WLANs and tactical point-to-point
communications systems in the 1755-1850 MHz
band.

Use expected to increase.

1842- 1850

FIXED

MOBILE

S5.341

None

Point-to-Point. Numerous Federal agencies
operate fixed point-to-point medium capacity
microwave systems in this band for such purposes as
hydropower and dam control, air traffic control
communications, Federal law enforcement, natural
resource management, tactical radio relay.

Fixed & Mobile. Mobile use both on ground and
airborne are for air-to-ground video telemetry, air
combat training systems, guided weapons systems
and robotics control. Additionally, some agencies are
using WLANs and tactical point-to-point
communications systems in the 1755-1850 MHz
band.

NASA. The 2025-2110 MHz band is the primary
telecommand band used for the control of Agency
mission spacecraft. The band is used for uplinks
direct from ground stations and for forward links via
the TDRSS.

The wireless
communications service
will operate in this band
and consists of fixed,
mobile, satellite DARS,
and radiolocation services.

Use expected to continue.

2360- 2390

MOBILE US276

RADIOLOCATION G2

Fixed

G120

None

Fixed & Mobile. Mobile use both on ground and
airborne are for air-to-ground telemetry and robotics
control.

Telemetry. The 2360-2385 MHz band is used for
defense and commercial aerospace purposes for
telemetry in the flight testing and operation of aircraft,
spacecraft, missiles, and scientific balloons at military
test ranges and NASA centers.

Radio Astronomy. Arecibo operates a planetary
radar system on 2380 MHz.

Tactical & Training. Tactical and training operations
are conducted at various military test ranges on an
NIB basis.

Use expected to continue.

2640- 2655

None

US205 US269 S5.339

Space Research
(Passive) S5.339

Earth Exploration-Satellite (Passive)
S5.339

Radio Astronomy. Observations of the cosmos are
made in the band 2640-2750 MHz to study the low
galactic background radiation and both the ionized
hydrogen clouds and general diffuse radiation of the
Galaxy.

Scientific research is
expected to continue and
increase in this band.

2655- 2670

Earth Exploration Satellite
(passive)

Radio Astronomy

Space Research
(passive)

US205 US269

None

Radio Astronomy. Observations of the cosmos are
made in the band 2640-2750 MHz to study the low
galactic background radiation and both the ionized
hydrogen clouds and general diffuse radiation of the
Galaxy.

Scientific research is
expected to continue and
increase in this band.

2670- 2690

Earth Exploration-Satellite

(Passive)

Radio Astronomy

Space Research
(passive)

US205 US269

None

Space Research. Space-based observations and
measurements to advance many areas of global
change research such as water salinity, soil moisture,
etc. are made in this band.

Radio Astronomy. Observations of the cosmos are
made in the band 2640-2750 MHz to study the low
galactic background radiation and both the ionized
hydrogen clouds and general diffuse radiation of the
Galaxy.

Scientific research is
expected to continue and
increase in this band.

2690- 2700

EARTH EXPLORATION-SATELLITE (passive)

RADIO ASTRONOMY

SPACE RESEARCH
(passive)

US74 US246

None

Space Research. Space-based observations and
measurements to advance many areas of global
change research such as water salinity, soil moisture,
etc. are made in this band.

Radio Astronomy. Observations of the cosmos are
made in the band 2640-2750 MHz to study the low
galactic background radiation and both the ionized
hydrogen clouds and general diffuse radiation of the
Galaxy.

Scientific research is
expected to continue and
increase in this band.

2700- 2900

AERONAUTICAL
RADIONAVIGATION

METEOROLOGICAL
AIDS

Radiolocation

US18 S5.337 S5.423
G2 G15

None

Surveillance Radars. The FAA and military services
operate airport surveillance radars in this band for the
management and control of aircraft in at around
airports and military installations.

WXD Radars. Large numbers of weather radars,
including NEXRAD, operate in this band.

Radio Astronomy. Observations of the cosmos are
made in the band 2640-2750 MHz to study the low
galactic background radiation and both the ionized
hydrogen clouds and general diffuse radiation of the
Galaxy.

Military Radars. This band is extensively used by
the military services' radiolocation systems throughout
the U.S.

Maritime Radionav. The Coast Guard and, to a
lesser degree, the Navy operate maritime
radionavigation systems in this band.

Use expected to continue.

WRC-03 agenda item to
pursue co-primary
radiolocation allocation.

3100- 3300

RADIOLOCATION

Earth Exploration-Satellite (active)

Space Research (active)

MOD S5.149 US110
G59

None

Military Radars. This band is extensively used by all
the military services' radiolocation systems throughout
the U.S.

Space Research. NASA space-based
measurements supporting geodetic and geologic
sciences, etc., are made in this band.

No changes are planned.
Use expected to increase.

3300- 3400

RADIOLOCATION

S5.149 US108 G31

None

Military Radars. This band is extensively used by
the military services' radiolocation systems throughout
the U.S.

No changes are planned.
Use expected to increase.

3400- 3410

RADIOLOCATION

S5.149 US108 S5.282
G31

None

Military Radars. This is a critical radar band and is
used extensively by all the military services.

No changes are planned.
Use expected to increase.

3410- 3500

RADIOLOCATION

S5.149 US108 G31

None

Military Radars. This is a critical radar band and is
used extensively by all the military services.

No changes are planned.
Use expected to increase.

3500- 3600

AERONAUTICAL
RADIONAVIGATION

(Ground-based)

RADIOLOCATION

US110 G59 G110

None

Military Radars. This is a critical radar band and is
used extensively by all the military services. In
particular, the U.S. Navy uses this band for
surveillance and precision approach radars to support
its naval air operations.

No changes are planned.
Use expected to continue.

3600- 3700

AERONAUTICAL
RADIONAVIGATION

(Ground-based)

RADIOLOCATION

US110 US245 G59
G110

None

Military Radars. This is a critical radar band and is
used extensively by all the military services. In
particular, the military services operate fixed and
mobile radionavigational systems in this band as well
as performing sensor and navigational system
calibrations.

Experimental. Research, developmental, test and
evaluation of various radiolocation devices are made
in this band.

The 3650- 3700 MHz
band was reallocated to
the private sector on Jan
1, 1999 under OBRA-93.

Use expected to continue.

3700- 4200

None

None

Earth Stations. The military services operate earth
stations that receive voice, data, video signals from
an international common carrier GSO satellite
system.

Tactical & Training. This band is heavily used for
military tactical and training communications, both for
line-of-sight, troposcatter and tactical data links.

NASA. Used on NIB basis for development of aircraft
video downlinks.

No changes are planned.
Use expected to increase.

4500- 4635

FIXED

MOBILE

US245

None

Tactical & Training. This band is heavily used for
military tactical and training communications, both for
line-of-sight and troposcatter. Additionally, the DOD
operates tactical data links, drone command and
control systems, and numerous other systems.

NASA. Used on NIB basis for development of aircraft
video downlinks.

Radio Astronomy. Continuum observations are
performed in this band.

No changes are planned.
Use expected to increase.

4635- 4660

None

US245 G125

None

Fixed & Mobile. On an NIB basis, numerous Federal
fixed operations use this band for point-to-point
microwave, air combat training systems, tactical data
links, drone command and control systems, and
numerous other systems.

Radio Astronomy. Continuum observations are
performed in this band.

The 4635-4685 MHz band
that was reclaimed and
4940-4990 MHz was
substituted for reallocation
under OBRA-93.

Use expected to increase.

4660- 4685

None

G122

None

Fixed & Mobile. On an NIB basis, numerous Federal
fixed operations use this band for point-to-point
microwave, air combat training systems, tactical data
links, drone command and control systems, and
numerous other systems.

Radio Astronomy. Continuum observations are
performed in this band.

The 4635-4685 MHz band
that was reclaimed and
4940-4990 MHz was
substituted for reallocation
under OBRA-93.

Use expected to increase.

4685- 4800

FIXED

MOBILE

US245

None

Fixed & Mobile. On an NIB basis, numerous Federal
fixed operations use this band for point-to-point
microwave, air combat training systems, tactical data
links, drone command and control systems, and
numerous other systems.

Radio Astronomy. Continuum observations are
performed in this band.

No changes are planned.
Use expected to increase.

4800- 4825

FIXED

MOBILE

S5.149

None

Fixed & Mobile. Numerous Federal fixed operations
use this band for point-to-point microwave, air combat
training systems, tactical data links, drone command
and control systems, and numerous other systems.

Radio Astronomy. Continuum observations are
performed in this band.

No changes are planned.
Use expected to increase

4825- 4835

FIXED

MOBILE

S5.149 US203

None

Tactical & Training. This band is heavily used for
military tactical and training communications, both for
line-of-sight and troposcatter. Additionally, the DOD
operates tactical data links, drone command and
control systems, and numerous other systems.

Radio Astronomy. Extremely useful in studying the
brightness distributions of both galactic and
extragalactic objects such as ionized hydrogen clouds
and supernova remnants.

No changes are planned.
Use expected to increase.

4835- 4950

FIXED

MOBILE

S5.149

None

Tactical & Training. This band is heavily used for
military tactical and training communications, both for
line-of-sight and troposcatter. Additionally, the DOD
operates tactical data links, drone command and
control systems, and numerous other systems.

Radio Astronomy. Continuum observations are
performed in this band.

The 4940-4990 MHz
band, in lieu of the
4635-4685 MHz band that
was reclaimed, was
reallocated to the private
sector under OBRA-93.

Use expected to increase.

4950- 4990

FIXED

MOBILE

S5.149 S5.339
US257

Space Research
(passive) S5.339

Earth Exploration-Satellite (passive)
S5.339

Fixed & Mobile. This band is heavily used for
military tactical and training communications, both for
line-of-sight and troposcatter. Additionally, the DOD
operates tactical data links, drone command and
control systems, and numerous other systems.

Radio Astronomy. This band is extremely useful in
studying the brightness distributions of both galactic
and extragalactic objects such as ionized hydrogen
clouds and supernova remnants.

The 4940-4990 MHz
band, in lieu of the
4635-4685 MHz band that
was reclaimed, was
reallocated to the private
sector under OBRA-93.

Use expected to increase.

4990- 5000

RADIO ASTRONOMY

Space Research
(passive)

S5.149 US74 US246

None

Radio Astronomy. This band is extremely useful in
studying the brightness distributions of both galactic
and extragalactic objects such as ionized hydrogen
clouds and supernova remnants.

As the U.S. transitions to
satellite-based navigation,
additional MLS
development is not
anticipated. MLS phase-down is expected to begin
in 2008. FAA and the civil
aviation community are
investigating aeronautical
applications in this band to
include (1) an extension of
the tuning range of the
TDWR; and or (2) weather
functions for a planned
multipurpose terminal
radar for around the year
2013.

5150- 5250

AERONAUTICAL

RADIONAVIGATION

US211 US260 US307

Aeronautical Mobile
US260

Experimental. Numerous test and evaluations are
being conducted on various radiocommunications
systems in this band.

No changes are planned.
Use expected to continue.

5250- 5255

RADIOLOCATION

EARTH EXPLORATION-SATELLITE (active)

SPACE RESEARCH

S5.447D

US110 G59

None

Military Radars. The military services have various
types of radars (missile detection, imaging, synthetic
aperture radar, frequency agile, ship sensor, etc.)
operating in this band.

Military Radars. This band contains fixed,
transportable, and mobile radars whose purposes are
used primarily for surveillance radars, test range
instrumentation radars, airborne transponders and
experimental radar testing. Extensive use of these
radars is in support of national and military test range
operations in the tracking and control of manned and
unmanned airborne vehicles.

Military Radars. This band contains fixed,
transportable, and mobile radars whose purposes are
used primarily for surveillance radars, test range
instrumentation radars, airborne transponders and
experimental radar testing. Extensive use of these
radars is in support of national and military test range
operations in the tracking and control of manned and
unmanned airborne vehicles. Other radars support
missile and satellite tracking during launch and
on-orbit.

Military Radars. This band contains fixed,
transportable, and mobile radars whose purposes are
used primarily for surveillance radars, test range
instrumentation radars, airborne transponders and
experimental radar testing. Extensive use of these
radars is in support of national and military test range
operations in the tracking and control of manned and
unmanned airborne vehicles. Other radars support
missile and satellite tracking during launch and
on-orbit.

Military Radars. This band contains fixed,
transportable, and mobile radars whose purposes are
used primarily for surveillance radars, test range
instrumentation radars, airborne transponders and
experimental radar testing. Extensive use of these
radars is in support of national and military test range
operations in the tracking and control of manned and
unmanned airborne vehicles.

NASA. This band is used for missile tracking via
radar.

No changes are planned.
Use expected to increase.

5925- 6425

None

None

Earth Stations. Federal agencies operate earth
stations that transmit voice, data, video signals to an
international common carrier GSO satellite system.
Some of the users are BBG, FAA, and military
services.

Experimental. Some RDT&E of
radiocommunications equipment is performed in this
band.

Use expected to continue.

7125- 7145

FIXED

S5.458 G116

SPACE OPERATIONS
G116

Point-to-Point. This band is used for fixed point-to-point microwave links associated with many Federal
agencies' missions including the DOD's national and
military test range communications, and the remoting
of data for such functions as air traffic control radar,
weather, vessel traffic information, power
management, etc.

Experimental. Some experimental test stations
operate at national and military test ranges. Also,
NASA is conducting development testing at the DSN
26m antenna in support of Mars Global Surveyor..

No changes are planned.
Use expected to continue.

7145- 7155

FIXED

SPACE RESEARCH
(Earth-to-space)

S5.458 US252 G116

SPACE OPERATIONS
G116

Point-to-Point. This band is used for fixed point-to-point microwave links associated with many Federal
agencies' missions including the DOD's national and
military test range communications, and the remoting
of data for such functions as air traffic control radar,
weather, vessel traffic information, power
management, etc.

Point-to-Point. This band is used for fixed point-to-point microwave links associated with many Federal
agencies' missions including the DOD's national and
military test range communications, and the remoting
of data for such functions as air traffic control radar,
weather, vessel traffic information, power
management, etc.

No changes are planned.
Use expected to continue.

7190- 7235

FIXED

SPACE RESEARCH

(Earth-to-space)

S5.458

None

NASA Near Earth. NASA tracking, ranging, and
command uplinks in support of various programs
such as the Summer Undergraduate Research
Fellowship Satellites I & II (SURFSAT), Space
Program Wideband Data Collection System,
international remote sensing satellites, etc.

Point-to-Point. This band is used for fixed point-to-point microwave links associated with many Federal
agencies' missions including the DOD's national and
military test range communications, and the remoting
of data for such functions as air traffic control radar,
weather, vessel traffic information, power
management, etc.

No changes are planned.
Use expected to continue.

7235- 7250

FIXED

S5.458

None

Point-to-Point. This band is primarily used for fixed
point-to-point microwave links associated with many
Federal agencies' missions including the DOD's, and
the remoting of data for such functions as air traffic
control radar, weather, vessel traffic information,
power management, etc.

No changes are planned.
Use expected to continue.

7250- 7300

FIXED-SATELLITE
(space-to-Earth)

MOBILE-SATELLITE
(space-to-Earth)

Fixed

G117

None

Point-to-Point. This band is primarily used for fixed
point-to-point microwave links associated with many
Federal agencies' missions including the DOD's, and
the remoting of data for such functions as air traffic
control radar, weather, vessel traffic information,
power management, etc.

Military SATCOM. In this band, the DOD uses the
Defense Satellite Communications Systems (DSCS)
downlinks for global voice and data communications
as well as NATO SATCOM .

Point-to-Point. This band is primarily used for fixed
point-to-point microwave links associated with many
Federal agencies' missions including the DOD's, and
the remoting of data for such functions as air traffic
control radar, weather, vessel traffic information,
power management, etc.

Military SATCOM. In this band, the DOD uses the
Defense Satellite Communications Systems (DSCS)
downlinks for global voice and data communications
as well as NATO SATCOM.

No changes are planned.
Use expected to continue.

7450- 7550

FIXED

FIXED-SATELLITE
(space-to-Earth)

METEOROLOGICAL-

SATELLITE (space-to-Earth)

Mobile-Satellite

(space-to-Earth)

G104 G117

None

Point-to-Point. This band is primarily used for fixed
point-to-point microwave links associated with many
Federal agencies' missions including the DOD's, and
the remoting of data for such functions as air traffic
control radar, weather, vessel traffic information,
power management, etc.

Military SATCOM. In this band, the DOD uses the
Defense Satellite Communications Systems (DSCS)
downlinks for global voice and data communications
as well as NATO SATCOM.

No changes are planned.
Use expected to continue.

7550- 7750

FIXED

FIXED-SATELLITE
(space-to-Earth)

Mobile-Satellite

(space-to-Earth)

G117

None

Point-to-Point. This band is primarily used for fixed
point-to-point microwave links associated with many
Federal agencies' missions including the DOD's, and
the remoting of data for such functions as air traffic
control radar, weather, vessel traffic information,
power management, etc.

Military SATCOM. In this band, the DOD uses the
Defense Satellite Communications Systems (DSCS)
downlinks for global voice and data communications
as well as NATO SATCOM.

Point-to-Point. This band is primarily used for fixed
point-to-point microwave links associated with many
Federal agencies' missions including the DOD's, and
the remoting of data for such functions as air traffic
control radar, weather, vessel traffic information,
power management, etc.

No changes are planned.
Use expected to continue.

7850- 7900

FIXED

None

Point-to-Point. This band is primarily used for fixed
point-to-point microwave links associated with many
Federal agencies' missions including the DOD's, and
the remoting of data for such functions as air traffic
control radar, weather, vessel traffic information,
power management, etc.

No changes are planned.
Use expected to continue.

7900- 8025

FIXED-SATELLITE
(Earth-to-space)

MOBILE-SATELLITE
(Earth-to-space)

Fixed

G117

None

Point-to-Point. This band is primarily used for fixed
point-to-point microwave links associated with many
Federal agencies' missions including the DOD's, and
the remoting of data for such functions as air traffic
control radar, weather, vessel traffic information,
power management, etc.

Military SATCOM. In this band, the DOD uses the
Defense Satellite Communications Systems (DSCS)
uplinks for global voice and data communications as
well as NATO SATCOM.

TT&C. Also, space tracking & telecommand of
SATCOMs are done in this band.

No changes are planned.
Use expected to continue.

8025- 8175

EARTH EXPLORATION-SATELLITE (space-to-Earth)

FIXED

FIXED-SATELLITE
(Earth-to-space)

Mobile-Satellite (Earth-to-space) (No Airborne
Transmission)

US258 G117

None

Point-to-Point. This band is primarily used for fixed
point-to-point microwave links associated with many
Federal agencies' missions including the DOD's, and
the remoting of data for such functions as air traffic
control radar, weather, vessel traffic information,
power management, etc.

Military SATCOM. In this band, the DOD uses the
Defense Satellite Communications Systems (DSCS)
uplinks for global voice and data communications as
well as NATO SATCOM.

TT&C. Also, space tracking & telecommand of
SATCOMs are done in this band.

Earth Exploration. The 8025-8400 MHz band is the
primary wideband data return for spaceborne sensors.

Point-to-Point. This band is primarily used for fixed
point-to-point microwave links associated with many
Federal agencies' missions including the DOD's, and
the remoting of data for such functions as air traffic
control radar, weather, vessel traffic information,
power management, etc.

Military SATCOM. In this band, the DOD uses the
Defense Satellite Communications Systems (DSCS)
uplinks for global voice and data communications as
well as NATO SATCOM.

TT&C. Also, space tracking & telecommand of
SATCOMs are done in this band.

Earth Exploration. The 8025-8400 MHz band is the
primary wideband data return for spaceborne sensors.

Point-to-Point. This band is primarily used for fixed
point-to-point microwave links associated with many
Federal agencies' missions including the DOD's, and
the remoting of data for such functions as air traffic
control radar, weather, vessel traffic information,
power management, etc.

Military SATCOM. In this band, the DOD uses the
Defense Satellite Communications Systems (DSCS)
uplinks for global voice and data communications.

TT&C. Also, space tracking & telecommand of
SATCOMs are done in this band.

Earth Exploration. The 8025-8400 MHz band is the
primary wideband data return for spaceborne sensors.

Point-to-Point. This band is primarily used for fixed
point-to-point microwave links associated with many
Federal agencies' missions including the DOD's, and
the remoting of data for such functions as air traffic
control radar, weather, vessel traffic information, etc.

Point-to-Point. This band is primarily used for fixed
point-to-point microwave links associated with many
Federal agencies' missions including the DOD's, and
the remoting of data for such functions as air traffic
control radar, weather, vessel traffic information, etc.

Space Research. Some Federal agencies are
conducting research and downlinking collected data
from such activities as the measurement of Earth &
space phenomena, seismic activity, etc.

NASA. NASA use includes downlinks for remote
sensing spacecraft including the EOS and the
Surfsat. In Addition, the band is under consideration
for the Next Generation Space Telescope.

No changes are planned.
Use expected to continue.

8500- 8550

RADIOLOCATION

US110 G59

None

Radars. Mobile and fixed radars operate in this band
for RDT&E support, air and surface target tracking,
and for NASA's planetary radar.

No changes are planned.
Use expected to continue.

8550- 8650

RADIOLOCATION

EARTH EXPLORATION-SATELLITE (active

SPACE RESEARCH
(active)

US110 G59

None

Military Radars. Various military target tracking
radars and experimental radars undergoing RDT&E
use this band extensively.

Space Research. Also in this band are synthetic
aperture radars aboard space-borne vehicles studying
Earth sciences.

No changes are planned.
Use expected to continue.

8650- 8750

RADIOLOCATION

US53 US110 G59

Aeronautical
Radionavigation US53

Military Radars. This band is used by the military
services for mobile and transportable target
acquisition radars, radar RDT&E activities on national
and military test ranges, and tactical and training
exercises.

No changes are planned.
Use expected to continue.

8750- 8850

RADIOLOCATION

US53 US110 G59

Aeronautical
Radionavigation US53

Military Radars. This band is used by the military
services for mobile and transportable target
acquisition radars, radar RDT&E activities on national
and military test ranges, and tactical and training
exercises.

No changes are planned.
Use expected to continue.

8850- 9000

RADIOLOCATION

US53 US110 G59

Aeronautical
Radionavigation US53

Military Radars. This band is used by the military
services for mobile and transportable target
acquisition radars, radar RDT&E activities on national
and military test ranges, and tactical and training
exercises.

No changes are planned.
Use expected to continue.

9000- 9200

AERONAUTICAL
RADIONAVIGATION

Radiolocation

US48 US54 S5.337
G2 G19

None

Aero-Radionav. This band is used extensively by the
military services for precision approach radars.

No changes are planned.
Use expected to increase.
The FAA has plans for
ASDE-X radars.

9200- 9225

MARITIME
RADIONAVIGATION

Radiolocation

US110 S5.472 S5.474
G59

None

Military Radars. This band is used by the military
services for mobile and transportable target
acquisition radars, radar RDT&E activities on national
and military test ranges, and tactical and training
exercises.

No changes are planned.
Use expected to increase.

9225- 9300

MARITIME
RADIONAVIGATION

Radiolocation

US110 S5.472 S5.474
G59

None

Military Radars. This band is used by the military
services for mobile and transportable target
acquisition radars, radar RDT&E activities on national
and military test ranges, and tactical and training
exercises.

No changes are planned.
Use expected to increase.

9300- 9500

RADIONAVIGATION

Meteorological Aids

Radiolocation

US51 US66 US67
US71 S5.427 S5.474
S5.476 G56

None

Maritime Radionav. Used by the USCG for harbor
surveillance radars in support of vessel traffic
services.

Military Radars. The military services use this band
for their mobile and transportable radars.

No changes are planned.
Use expected to increase.

9500- 9800

RADIOLOCATION

EARTH EXPLORATION-SATELLITE (active)

SPACE RESEARCH
(active)

S5.479 US110

None

Military Radars. Used extensively for military tactical
and training in the use of its various radar systems.
Some Military RDT&E of radars systems is done in
this band.

Research. Supports NASA airborne radar in the
research and experimentation of convective storm
and mesoscale phenomena. Also used by NASA and
collaborators for active microwave sensing of the
Earth's surface.

No changes are planned.
Use expected to increase.

9800- 9975

RADIOLOCATION

US110

None

Military Radars. Used extensively for military tactical
and training in the use of its various radar systems.
Some RDT&E of radars systems is done in this band.

No changes are planned.
Use expected to increase.

9975- 10000

RADIOLOCATION

S5.479 US110

Meteorological-Satellite
S5.479

Military Radars. Used for military tactical and
training in the use of its various radar systems. Some
RDT&E of radars systems is done in this band.